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Investments (AFS by Type) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Investments    
Allowance for Credit Loss $ (27)  
Fair value of investment securities pledged as collateral 3,600 $ 2,200
Fair value of investment securities pledged as collateral that may be repledged by the counterparty 454 576
Corporate debt securities [Member]    
Investments    
Allowance for Credit Loss 10 0 [1]
Ameriprise Financial [Member]    
Investments    
Amortized cost 33,601 31,332
Gross unrealized gains 2,727 1,834
Gross unrealized losses (34) (37)
Allowance for Credit Loss (11)  
Available-for-sale securities 36,283 33,129
Accrued interest excluded from amortized cost basis 178 177
Ameriprise Financial [Member] | Corporate debt securities [Member]    
Investments    
Amortized cost 11,762 10,847
Gross unrealized gains 1,924 1,344
Gross unrealized losses (2) (4)
Allowance for Credit Loss (10)  
Available-for-sale securities 13,674 12,187
Ameriprise Financial [Member] | Residential mortgage backed securities [Member]    
Investments    
Amortized cost 9,845 9,954
Gross unrealized gains 188 94
Gross unrealized losses (4) (19)
Available-for-sale securities 10,029 10,029
Ameriprise Financial [Member] | Commercial mortgage backed securities [Member]    
Investments    
Amortized cost 5,867 5,473
Gross unrealized gains 242 96
Gross unrealized losses (21) (6)
Available-for-sale securities 6,088 5,563
Ameriprise Financial [Member] | Asset backed securities [Member]    
Investments    
Amortized cost 3,283 1,968
Gross unrealized gains 52 42
Gross unrealized losses (5) (4)
Allowance for Credit Loss (1)  
Available-for-sale securities 3,329 2,006
Ameriprise Financial [Member] | State and municipal obligations [Member]    
Investments    
Amortized cost 1,088 1,131
Gross unrealized gains 297 238
Gross unrealized losses (1) (2)
Available-for-sale securities 1,384 1,367
Ameriprise Financial [Member] | U.S. government and agencies obligations [Member]    
Investments    
Amortized cost 1,456 1,679
Gross unrealized gains 0 1
Gross unrealized losses   0
Available-for-sale securities 1,456 1,680
Ameriprise Financial [Member] | Foreign government bonds and obligations [Member]    
Investments    
Amortized cost 241 254
Gross unrealized gains 22 19
Gross unrealized losses (1) (2)
Available-for-sale securities 262 271
Ameriprise Financial [Member] | Other Debt Obligations    
Investments    
Amortized cost 59 26
Gross unrealized gains 2 0
Gross unrealized losses   0
Available-for-sale securities $ 61 $ 26
[1] Prior to January 1, 2020, credit losses on Available-for-Sale securities were not recorded in an allowance but were recorded as a reduction of the book value of the security if the security was other-than-temporarily impaired. There is no adoption impact due to the prospective transition for Available-for-Sale securities.